fix misc field conversion. bump version

fix misc field conversion

update dependencies chardet and urllib3

fix issue with user-agent

add support for tournaments.open_for_predictions endpoint

update CHANGELOG, add CONTRIBUTORS.txt and fix PEP8 issue with the ne…

…w parsing fix

version bump 1.8.0

clean up for the 1.7.0 version

just changing version to 1.6.7